EP0530501B1 - Method and device for glue coating of particles - Google Patents

Method and device for glue coating of particles Download PDF

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Publication number
EP0530501B1
EP0530501B1 EP92112993A EP92112993A EP0530501B1 EP 0530501 B1 EP0530501 B1 EP 0530501B1 EP 92112993 A EP92112993 A EP 92112993A EP 92112993 A EP92112993 A EP 92112993A EP 0530501 B1 EP0530501 B1 EP 0530501B1
Authority
EP
European Patent Office
Prior art keywords
glue
particles
pipe
electrostatic charge
charge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92112993A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0530501A1 (en
Inventor
N. Lennart Eriksson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet AB
Original Assignee
Sunds Defibrator Industries AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sunds Defibrator Industries AB filed Critical Sunds Defibrator Industries AB
Publication of EP0530501A1 publication Critical patent/EP0530501A1/en
Application granted granted Critical
Publication of EP0530501B1 publication Critical patent/EP0530501B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent

Definitions

  • This invention refers to a method and a device for the glue coating of particles, primarily of cellulose material such as fibres and chips, in connection with the manufacture of e.g. fiber board according to the dry method, so-called MDF (Medium Density Fiberboard), dry-formed paper and particle board, according to the preambles of claims 1 and 7, respectively.
  • MDF Medium Density Fiberboard
  • the admixture of glue has the object to improve the bond between the particles in order to achieve a strong fibre, chip or paper product.
  • the glue is of the heat-curing type.
  • For fibre and chip products normally urea formaldehyde resin and phenol resin are used.
  • For paper products other binding agents are used, for example latex.
  • blow line glue coating is applied for glue coating.
  • the fibres are produced in a pulper, whereafter the fibres, together with the steam generated in the pulper and a small amount of water, are transported through a line to a drier.
  • the speed in this blow line is 30-300 m/s. Due to the high turbulence in the blow line, the liquid glue injected into the blow line at high pressure is atomized and adheres to the fibres.
  • Such a method and corresponding apparatus is known from US-A-4 510 184 on which the preambles of claims 1 and 7 are based.
  • the present invention solves the aforesaid problem and offers additional advantages.
  • the invention implies, that prior to their mixture a different electrostatic charge is applied to the glue and particles, so that a strong attractive force arises between the same.
  • the characterizing features of the invention are defined in the attached claims.
  • the amount of particles normally being greater than the amount of glue it is particularly suitable to apply a controlled and adjustable charge on the glue.
  • the particles can be charged during their transport before the place of mixture.
  • the glue can be in liquid or powder state and be of the type stated above.
  • the charging of the glue can be effected by means of an external current source or by friction charge.
  • the latter can be used with powdered glue, and the glue is charged by friction against the transport line, which preferably is a plastic line.
  • a suitable charge is 5000 - 100 000 V.
  • the method according to the invention generally, yields a greater flexibility in choosing the place in the process where the glue coating can take place.
  • liquid glue according to the invention contrary to conventional blow line glue coating, renders it possible to add the glue in a position where the temperature is lower than in the blow line, whereby the glue is less cured and, consequently, the glue consumption is smaller.
  • the admixture of dry glue according to the invention implies, that the total energy consumption can be reduced because no energy need to be supplied for evaporating the water contained in the liquid glue. This is an advantage, in spite of the fact that the glue is more expensive because it may be necessary at the manufacture of the glue to dry the glue from e.g. 60% dry matter content to 90% dry matter content. A saving of energy of up to 10% compared with conventional blow line glue coating can be obtained. This corresponds also to a 10% reduction in the glue of the drier or to a 10% higher capacity of the drier installed.
  • Particles in the form of fibres are transported through a pipe 1 at a flow rate of 25-40 m/s.
  • the glue is supplied through a feed line 2 to the fibre material in the pipe 1 in such a way, that the glue meets the fibre flow.
  • the desired charge is applied to the glue by means of an external controllable current source 3.
  • the injection of the glue preferably takes place immediately before a bend of the pipe 1, in order to render possible a simple arrangement of the necessary equipment as shown in the Figure.
  • the charging of the glue can be effected by so-called friction charge.
  • Such a charging can be brought about by air transport of the glue in a plastic line where the charging can be controlled by the flow rate and the line length.
  • the glue supply can be controlled in a conventional way.
  • portion 4 of the pipe 1,where the glue is injected may be suitable to form portion 4 of the pipe 1,where the glue is injected, of an insulating material, such as plastic, porcelain, wood or the like whereby the charge of the glue and, respectively, particles is not conducted away.
  • an insulating material such as plastic, porcelain, wood or the like whereby the charge of the glue and, respectively, particles is not conducted away.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Paper (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
  • Adhesives Or Adhesive Processes (AREA)
EP92112993A 1991-09-05 1992-07-30 Method and device for glue coating of particles Expired - Lifetime EP0530501B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9102549 1991-09-05
SE9102549A SE502518C2 (sv) 1991-09-05 1991-09-05 Sätt och anordning för belimning av partiklar

Publications (2)

Publication Number Publication Date
EP0530501A1 EP0530501A1 (en) 1993-03-10
EP0530501B1 true EP0530501B1 (en) 1995-11-02

Family

ID=20383626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92112993A Expired - Lifetime EP0530501B1 (en) 1991-09-05 1992-07-30 Method and device for glue coating of particles

Country Status (5)

Country Link
EP (1) EP0530501B1 (sv)
AT (1) ATE129660T1 (sv)
DE (1) DE69205772T2 (sv)
ES (1) ES2079111T3 (sv)
SE (1) SE502518C2 (sv)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1296755B1 (it) * 1997-11-10 1999-07-27 E T A S R L Procedimento per la distribuzione di un agglomerante su particelle tra loro incoerenti.
DE10153593B4 (de) * 2001-11-02 2005-11-17 Fritz Egger Gmbh & Co Vorrichtung und Verfahren zum Benetzen von Holzfasern mit einem Bindemittelfluid

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3143895C2 (de) * 1981-11-05 1985-01-17 Triangel Spanplatten KG, 3177 Sassenburg Verfahren und Vorrichtung zum Beleimen von teilchenförmigem Gut in Form von Spänen, Fasern o.dgl.

Also Published As

Publication number Publication date
DE69205772T2 (de) 1996-04-04
ATE129660T1 (de) 1995-11-15
DE69205772D1 (de) 1995-12-07
ES2079111T3 (es) 1996-01-01
SE9102549D0 (sv) 1991-09-05
SE502518C2 (sv) 1995-11-06
SE9102549L (sv) 1993-03-06
EP0530501A1 (en) 1993-03-10

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